The External Ear | The Human Ear is Divided into Three Parts

Ilovebeed Team

The External Ear

The external or outer ear's the outer most portion of the ear that consist of two parts normally

It is that parts of the ear wich we come see from outside
The pinna is conical shaped structure and is attached to the head on ether side on angle of 20 degree to 40 degree
The pinna has various portion that include lelix anti-helix tragus concha and lable
The concha in the deeper portion in the center while the lobes is the in the softest lower portion wich has an
The entire pinna is mode up of an elastic cartilaginous structure and it has no bones the blood and nerve supply keep the pinna live and active
The external auditory canal is "s" shaped tube that opens at the pinna but closed inside by tympanic membrane or the ear drum
an adult human auditory canal measure's about 2cc
The outer two third portion of the ear canal is cartilaginous on while the inner one third portion is bony
The entire canal is lined with skin or epithelial cells
Outer portion of the ear canal also has hair follicles on the skin
one both the side of the external audiotory canal a pair of glands namely ceremonius and sebaceous glands present
Ceremonious glands secrete wax or cerumen which protects the delicate and vital structure of middle ear and inner ear from dusts and germs
Sebaceous gland secrete a substance called "sebum" Which acts as lubricating agent helps in smooth transmission of sound waves from the external ear into the middle ear the blood and Norv supply helps the ear canal to carry out its functional is smooth and appropriate manner